a tap supplies water at 26oC while another supplies water at 82oC. If a man wishes to bathe with water at 40oC the ratio of hot mass of hot water to that of cold water required is
A1:3
B3:1
C3:7
D7:3
E15:8
View Explanation & Discuss
Question 872
waec1991
A team trap is a component of the apparatus used in determining the specific latent heat of vaporisation of steam. In the steady steady state, the steam trap
Astores the steam for future use
Bprevents the steam from escaping
Censures that only dry steam gets into the calorimeter
Dallows condensed steam to go into the calorimeter
Edetermine the quantity of steam used
View Explanation & Discuss
Question 873
waec1991
The boiling point of a liquid depends on the following except the
Anature of the liquid
Bexternal pressure
Cvolume of the liquid
Dimpurities present in the liquid
Edegree of it's molecular cohesive force
View Explanation & Discuss
Question 874
waec1991
A fixed mass of gas of volume 600cm3 at a temperature of 27oC is cooled at constant pressure to a temperature of 0oC. What is the change in volume?
A54cm2
B273cm2
C300cm2
D546cm2
E600cm2
View Explanation & Discuss
Question 875
waec1991
The set-up illustrated above shows a capillary tube of uniform cross-sectional area in two different arrangements. Using the data in the diagrams. Calculate the pressure of the atmosphere
A76cm of Hg
B75cm of Hg
C74cm of Hg
D60cm of Hg
E45cm of Hg
View Explanation & Discuss
Question 876
waec1991
A water fall is 420m high. Calculate the difference in temperature of the water between the top and bottom of the water fall. Neglect heat loses(g = 10.0m-2 specific heat capacity of water = 4.20 x 10\(^3\) JKg-1 K-1)
A0.1oC
B1.0oC
C42oC
D100oC
E4.20oC
View Explanation & Discuss
Question 877
waec1991
A wire, 20m long is heated from a temperature of 5oC to 55oC. If the change in length is 0.020m, calculate the linear expansivity of the wire
A1.0 x 10-3k-1
B2.0 x 10-4k-1
C2.0 x 10-5k-1
D1.0 x 10-5k-1
E2.0 x 10-6k-1
View Explanation & Discuss
Question 878
waec1991
The diagram above represents six maximum and minimum thermometer. If the temperature of the surrounding falls, which of the following correctly states how the thermometer would respond to the change in temperature?
AS1, would move upward but S2 would not move
BS1 would not move but S2 would move upwards
Cboth S1 and S2 would move upwards
DS1 would move downwards and S2 would move downwardw
ES1 would move downwards and S2 wouldnmove downwards
View Explanation & Discuss
Question 879
waec1991
A boatman facing north wants to cross a flowing river to a point directly opposite its position at the other bank. If the river is flowing eastwards, in what direction should he row his boat?
Awest
Beast
Cnorth-west
Dnorth-east
Esouth-west
View Explanation & Discuss
Question 880
waec1991
The diagram represents a block-and-tackle pulley system on which an effort of 50N is just able to lift a load of weight W. If the efficiency of the machine is 40%. find the value of W
A300N
B200N
C140N
D120N
E20N
View Explanation & Discuss
Question 881
waec1991
The product PV where P is pressure and V is volume has the same unit as
Apower
Bwork
Cacceleration
Dimpulse
Eforce
View Explanation & Discuss
Question 882
waec1991
power is defined as the
Acapacity to exert a force
Bproduct of force and time
Cproduct of force and distance
Dability to do work
Eenergy expended per unit time
View Explanation & Discuss
Question 883
waec1991
An orange fruit drops to the ground from the top of a tree 45m tall. How long does it takes to reach the ground? (g = 10ms-2)
A3.0s
B4.5s
C6.0s
D7.5s
E9.0s
View Explanation & Discuss
Question 884
waec1991
the diagram above shows the position of a simple pendulum set in motion. At which of the positions does the pendulum have maximum kinetic energy?
A5
B4
C3
D2
E1
View Explanation & Discuss
Question 885
waec1991
A body moving with uniform acceleration has two points(5, 15) and (20, 60) on the velocity-times graph of its motion. Calculate the acceleration of the body
A0.25ms-2
B3.00ms-2
C4.00ms-2
D9.00ms-2
E16.00ms-2
View Explanation & Discuss
Question 886
waec1991
A ball is projected horizontally from the top of a hill with a velocity of 20m-1. If it reaches the ground 4 seconds later, what is the height of the hill? (g = 10ms-2)
A20m
B40m
C80m
D160m
E200m
View Explanation & Discuss
Question 887
waec1991
A body moves with a constant speed but has an acceleration. this process if it
Amoves in a straight line
Bmoves in a circle
Cis oscillating
Dis in equilibrum
Ehas a varrying acceleration
View Explanation & Discuss
Question 888
waec1991
Which of the following is a fundamental quantity?
Aspeed
Bdensity
Clenght
Dimpulse
Eenergy
View Explanation & Discuss
Question 889
waec1990
Which of the following is not an evidence of the particle nature of matter?
ADiffusion
BBrownian motion
CDiffraction
DCrystal structure
EPhotoelectricity
View Explanation & Discuss
Question 890
waec1990
What is the difference between a crystalline and an amorphous solid? A crystalline solid
Ahas cubic structure while amorphous solid has hexagonal structure
Bhas regularly-repeating pattern while an amorphous solid has not
Cis white while amorphous solid is yellow
Dis always hard while amorphous solid is always soft
Emelts on heating while an amorphous solid sublimates on heating.
